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portfolio
TOF-SIMS
Time of Flight Secondary Ion Mass Spectrometry
MBE-I
Combination MBE/Sputter chamber
Pulsed Laser Deposition (PLD)
Excimer laser firing into the vacuum deposition chamber
publications
Experimental study of the kinetically-limited decomposition of ZnGeAs2 and its role in determining optimal conditions for thin film growth
Published in Journal of Crystal Growth, 2012
Recommended citation: Experimental study of the kinetically-limited decomposition of ZnGeAs2 and its role in determining optimal conditions for thin film growth. M Vahidi, ZZ Tang, J Tucker, TJ Peshek, L Zhang, C Kopas, RK Singh, M Van Schilfgaarde, N Newman. Journal of Crystal Growth 338 (1), 267-271 (2012) DOI: 10.1016/j.jcrysgro.2011.11.004 https://www.sciencedirect.com/science/article/pii/S0022024811009171
Growth and characterization of Ba(Cd1/3Ta2/3)O3 thin films
Published in Thin Solid Films, 2012
This paper establishes growth conditions for high-quality Ba(Cd1/3Ta2/3)O3 thin films using pulsed laser deposition (PLD).
Recommended citation: Growth and characterization of Ba(Cd1/3Ta2/3)O3 thin films. LT Liu, C Kopas, RK Singh, RM Hanley, N Newman. Thin Solid Films 520 (19), (2012) DOI: 10.1016/j.tsf.2012.06.034 https://www.sciencedirect.com/science/article/pii/S0040609012007432
Effect of Helium Ion Irradiation on the Tunneling Behavior in Niobium/Aluminum–Aluminum Oxide/Niobium Josephson Junctions
Published in IEEE Transactions on Applied Superconductivity, 2013
This paper measures the effects of helium-ion irradation on Nb/Al-AlOx/Nb Josephson Junctions.
Recommended citation: Effect of Helium Ion Irradiation on the Tunneling Behavior in Niobium/Aluminum–Aluminum Oxide/Niobium Josephson Junctions. Tiantian Zhang, Cameron Kopas, Lei Yu, Ray W Carpenter, Makram A Qader, Mengchu Huang, Rakesh K Singh, John Mardinly, Robin Cantor, John M Rowell, Nathan Newman IEEE Transactions on Applied Superconductivity 23 (4), 1101610-1101610 (2014) DOI: 10.1109/TASC.2013.2256358. https://ieeexplore.ieee.org/document/6522170
Growth and characterization of Ba(Cd1/3Ta2/3)O3 thin films
Published in Journal of Crystal Growth, 2014
This paper establishes growth conditions for high-quality Ba(Co,Zn)1/3Nb2/3O3 thin films using pulsed laser deposition (PLD).
Recommended citation: Growth and characterization of epitaxial Ba(Co, Zn)1/3 Nb2/3O3 thin films. Y Li, C Kopas, M Huang, K Bunish, N Newman. Journal of Crystal Growth 387, 81-85 (2014) DOI: 10.1016/j.jcrysgro.2013.10.047 https://www.sciencedirect.com/science/article/pii/S002202481300729X
In-situ electron paramagnetic resonance studies of paramagnetic point defects in superconducting microwave resonators
Published in Applied Physics Letters, 2016
We developed an in-situ technique to measure paramagnetic loss in dielectric resonator structures.
Recommended citation: In-situ electron paramagnetic resonance studies of paramagnetic point defects in superconducting microwave resonators. S Zhang, C Kopas, B Wagner, D Queen, N Newman. Applied Physics Letters 109 (12), 122602 (2016). DOI: 10.1063/1.4962953 https://aip.scitation.org/doi/abs/10.1063/1.4962953
Magnetic properties of chromium-doped Ni80Fe20 thin films
Published in Journal of Magnetism and Magnetic Materials, 2018
This paper is about the magnetic properties of Cr-doped NiFe (permalloy) films.
Recommended citation: Magnetic properties of chromium-doped Ni80Fe20 thin films. Alex Devonport, Alena Vishina, RK Singh, Matthew Edwards, Kaiwen Zheng, John Domenico, ND Rizzo, Cameron Kopas, Mark van Schilfgaarde, Nathan Newman. Journal of Magnetism and Magnetic Materials 460 pp. 193-202 (2018). DOI: 10.1016/j.jmmm.2018.03.054 https://www.sciencedirect.com/science/article/pii/S0304885317335382
The influence of substrate temperature on the properties of pyrite thin films deposited using a sequential coevaporation technique
Published in Thin Solid Films, 2019
This paper documents a new sequential co-evaporation method for fabrication of FeS2 (iron pyrite) thin films, and the substrate temperature dependence on the film properties.
Recommended citation: The influence of substrate temperature on the properties of pyrite thin films deposited using a sequential coevaporation technique. A. Walimbe, A. Wertheim, A. Ravi, C. Kopas, et. al. Thin Solid Films 669, pp 49-5 (2019). DOI: 10.1016/j.tsf.2018.10.022 https://www.sciencedirect.com/science/article/pii/S0040609018306916
Low-temperature synthesis of 2D anisotropic MoTe2 using a high-pressure soft sputtering technique
Published in Nanoscale Advances, 2020
This paper documents a soft-sputtering technique for deposition of 2-D MoTe2 films.
Recommended citation: Low-temperature synthesis of 2D anisotropic MoTe2 using a high-pressure soft sputtering technique. Kentaro Yumigeta+, Cameron Kopas+, Mark Blei, Debarati Hajra, Yuxia Shen, Dipesh Trivedi, Pranvera Kolari, Nathan Newman, Sefaattin Tongay. Nanoscale Advances (2020) DOI: 10.1039/D0NA00066C https://pubs.rsc.org/en/content/articlehtml/2020/na/d0na00066c
(In review) Integrated High-Temperature YBa2Cu3O7-δ Superconductor-High-Performance Microwave Dielectric Thin Film Structures.
Published in , 2020
tri-layer Superconductor/dielectric/superconductor structures of high-Tc superconductor YBCO and low-loss high-performance microwave dielectrics BZT and BCT were fabricarted by introducing a SrTiO3 barrier layer between the YBCO and dielectric layers.
Recommended citation: (In Review) Integrated High-Temperature YBa 2 Cu 3 O7-δ Superconductor-High-Performance Microwave Dielectric Thin Film Structures. C. Kopas, J. Park, P. Balaji, K. Zhang, S. Gajare, N. Newman </p> </article> </div> Published in arXiv, 2020 The concentration of electrically active defects at Nb-Si interfaces can be minimized by optimizing the Si surface preperation, using an HF etch and an Ar ion mill. The dominant electrically-active defect is a Nb atom on a Si site. Recommended citation: (preprint) Low microwave loss in deposited Si and Ge thin-film dielectrics at near single-photon power and low temperatures. C. Kopas, J. Gonzales, S. Zhang, D. Queen, B. Wagner, N. Newman. (2020) https://arxiv.org/abs/2011.08359 https://arxiv.org/abs/2011.08359 Published in arXiv, 2021 Tantalum interdiffusion barrier layers are used to decrease intermixing and microwave loss in Nb-Ge superconducting microwave resonators. Recommended citation: (preprint) Tantalum Ge thin-films with tantalum diffusion-barriers for use in Nb-based superconductor technology. C. Kopas, S. Zhang, J. Gonzales, D. Queen, B. Wagner, R. Carpenter, N. Newman https://arxiv.org/abs/2104.12580 Published in , 2021 Low (∼10^-6) scale losses can be achieved in superconducting coplanar microwave resonators with deposited dielectrics. Recommended citation: Cameron J. Kopas, Justin Gonzales, Shengke Zhang, D. R. Queen, Brian Wagner, McDonald Robinson, James Huffman, and Nathan Newman , "Low microwave loss in deposited Si and Ge thin-film dielectrics at single-photon power and low temperatures", AIP Advances 11, 095007 (2021) https://doi.org/10.1063/5.0041525 https://dx.doi.org/10.1063/5.0041525 Published: This is a LabView program for measuring the temperature-dependent resistivity of a specimen with a four-point probe. The program was originally written by Lei Yu, and modified by many other students over the years including Alex Davenport, and me. It may include some modules provided by equipment vendors; those parts retain their original copyright. Published: This is a LabView (2014) program for measuring Hall and Van der Pauw resistivity of a specimen. The program was originally written by Lei Yu, and modified by many other students over the years including Alex Davenport, Alex Wertheim, Aditya Ravi, and me. It includes some modules provided by equipment vendors; those parts retain their original copyright. Published: This is a description of your conference proceedings talk, note the different field in type. You can put anything in this field. Published: Describing a technique to measure in-situ electron paramagnetic resonance (EPR) losses of films, or specific superconducting resonators. Using this technique we are able to identify and quantify microwave losses from Mn2+ ions in Ba(Zn1/3Ta2/3)O3, Co2+ ions in Ba(Nb1/3Ta2/3)O3, and losses from dangling bond states in thin-film deposited amorphous Silicon. Workshop, University 1, Department, 2015 This is a description of a teaching experience. You can use markdown like any other post. (preprint)Characterization of the Chemical and Electrical Properties of Defects at the Niobium-Silicon Interface.
(preprint) Ge thin-films with tantalum diffusion-barriers for use in Nb-based superconductor technology.
Low microwave loss in deposited Si and Ge thin-film dielectrics at single-photon power and low temperatures
resources
Resistivity Measurement Program
Hall Measurement Program
talks
Conference Proceeding talk 3 on Relevant Topic in Your Field
In-situ characterization of performance degrading defects in superconductor- dielectric microwave resonators
teaching
Teaching experience 2